<template>
  <div>
    <el-upload
    action="https://xiongyan.oss-cn-hangzhou.aliyuncs.com"
      :data="dataObj"
      list-type="picture"
      :multiple="false" :show-file-list="showFileList"
      :file-list="fileList"
      :before-upload="beforeUpload"
      :on-remove="handleRemove"
      :on-success="handleUploadSuccess"
      :on-preview="handlePreview">
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">只能上传jpg/png文件，且不超过10MB</div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="fileList[0].url" alt="">
    </el-dialog>
  </div>
</template>
<script>
    import {
        policy
    } from './policy'
    import {
        getUUID
    } from '@/utils'

    export default {
        name: 'singleUpload',
        props: {
            value: String
        },
        computed: {
            imageUrl() {
                return this.value;
            },
            imageName() {
                if (this.value != null && this.value !== '') {
                    return this.value.substr(this.value.lastIndexOf("/") + 1);
                } else {
                    return null;
                }
            },
            fileList() {
                return [{
                    name: this.imageName,
                    url: this.imageUrl
                }]
            },
            showFileList: {
                get: function() {
                    return this.value !== null && this.value !== '' && this.value !== undefined;
                },
                set: function(newValue) {}
            }
        },
        data() {
            return {
                dataObj: {
                    policy: '',
                    signature: '',
                    key: '',
                    ossaccessKeyId: '',
                    dir: '',
                    host: '',
                    // callback:'',
                },
                dialogVisible: false
            };
        },
        methods: {
            emitInput(val) {
                this.$emit('input', val)
            },
            handleRemove(file, fileList) {
                this.emitInput('');
            },
            handlePreview(file) {
                this.dialogVisible = true;
            },
            beforeUpload(file) {
                let _self = this;
                return new Promise((resolve, reject) => {
                    policy().then(response => {
                        console.log("响应的数据", response);
                        _self.dataObj.policy = response.data.policy;
                        _self.dataObj.signature = response.data.signature;
                        _self.dataObj.ossaccessKeyId = response.data.accessid;
                        _self.dataObj.key = response.data.dir + getUUID() + '_${filename}';
                        _self.dataObj.dir = response.data.dir;
                        _self.dataObj.host = response.data.host;
                        console.log("响应的数据222。。。", _self.dataObj);
                        resolve(true)
                    }).catch(err => {
                        reject(false)
                    })
                })
            },
            handleUploadSuccess(res, file) {
                console.log("上传成功...")
                this.showFileList = true;
                this.fileList.pop();
                this.fileList.push({
                    name: file.name,
                    url: this.dataObj.host + '/' + this.dataObj.key.replace("${filename}", file.name)
                });
                this.emitInput(this.fileList[0].url);
            }
        }
    }
</script>
<style>

</style>
